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The distribution system transports steam from the boiler to the various end-uses. Although distribution systems may appear to be passive, in reality, these systems regulate the delivery of steam and respond to changing temperatures and pressure requirements. Consequently, proper performance of the distribution system requires careful design practices and effective maintenance. The piping should be properly sized, supported, insulated, and configured with adequate flexibility. Pressure-regulating devices such as pressure-reducing valves and backpressure turbines should be configured to provide a proper steam balance among the different steam headers. Additionally, the distribution system should be configured to allow adequate condensate drainage, which requires adequate drip leg capacity and proper steam trap selection.
Maintenance of the system is important, especially:
●to ensure that traps operate correctly (see Section 3.2.12)
●that insulation is installed and maintained (see Section 3.2.11)
●that leaks are detected and dealt with systematically by planned maintenance. This is assisted by leaks being reported by operators and dealt with promptly. Leaks include air leaks on the suction side of pumps
●checking for and eliminating unused steam lines.

蒸汽配送系統主要是將蒸汽從鍋爐引送到不同的終端使用處。雖然配送系統看來是被動的，實際上它控管蒸汽的傳送外，還包括所需溫度與壓力的變動。當然蒸汽配送系統要適當地運作則需要詳細地設計和良好的保養。輸配的管線配管必須有正確的管徑支撐，絕熱及架構要保持彈性。系統中要裝設壓力調節裝置，例如減壓閥或利用背壓式渦輪機。此外，蒸汽配送系統應設置適當的凝結水排放口、適當的排放能力及選用適當的蒸汽祛水器。
系統的維護保養很重要，特別是下列各項：
●確認祛水器作動正常
●確認絕熱設施裝設與維護良好
●確認查漏工作正確，且有妥善的維護計畫，有系統性的對應修復作業。這些查漏工作必須由操作人員報告，且要立刻採取作為。查漏還要包括泵浦吸入端空氣洩入的問題。
●檢查是否有不再使用的蒸汽管線，如有則予以淘汰。